Locking device



FIG. 1 is a perspective view of a locking device showing our new design;

FIG. 2 is right side elevational view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is front view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a rear view thereof;

FIG. 7 is a left side elevational view thereof; and,

FIG. 8 is an additional perspective view thereof.

The broken line environmental showing is for illustrative purposes onlyand forms no part of the claimed design.

The ornamental design for a locking device, as shown and described.